yellowing trees

Silvicultural Decision Guide for Swiss Needle Cast in Coastal Oregon and Washington

Swiss needle cast is a significant disease for Douglas-fir trees in the coastal Pacific Northwest. The disease turns foliage yellow, reduces needle retention, thins crowns and reduces tree growth. Options for forest managers include planting alternative species and using improved seed stock. Research shows that management is nuanced, and much depends on site conditions.

EM 9352    Published May 2022   


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